Ceramic knives

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catavengercaptain
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Ceramic knives

Postby catavengercaptain » Thu Jul 08, 2010 11:58 pm

Thought I would make a new topic here since there hasn'nt been one in 5 months. Has anyone tried one of these Yoshi knives? https://www.yoshibladeknife.com I was just wondering if they are any good? :?:

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Milu
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Re: Ceramic knives

Postby Milu » Fri Jul 09, 2010 12:10 am

Not tried the Yoshi but I have tried the latest generation Kyocera and I'm not as impressed as I should be after all the hype. I was expecting a kitchen razor that held an edge. What I got was a reasonably sharp kitchen knife that was fragile. I would stick to carbon steel. Another downer is sharpening, the kind of edge I like is way too delicate in ceramic and even if the hype says they go forever and a day before needing to be sharpened I am not convinced and they are a pain to sharpen whether you do it yourself or have it done professionally (A cutler I know charges triple because of the extra wear on his kit) What I found best was honing on a piece of old saddle leather to polish the edge, if you do it from new they seem to gain a sharper edge.
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Vagrant
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Re: Ceramic knives

Postby Vagrant » Fri Jul 09, 2010 1:06 am

You confirmed ny suspecions that, ceramic is too brittle to take a true razor edge.
And saved me $$$ from finding out for myself :wink:
I also assume if you drop one you own two or three ;]

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Milu
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Re: Ceramic knives

Postby Milu » Fri Jul 09, 2010 5:54 am

You've got it in one. I learned the hardway. You don't put them in the drawer with steel lnive either. Max sharp is still an obsidian blade which is what certain scalpels are made with. I'm sure I've seen obsidian blades on daggers posted here and I'll bet they're also brittle.
"se me burlé, me fico un cento e vinti in tel stomego"

Goldoni: La donna di Garbo, 1753

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catavengercaptain
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Re: Ceramic knives

Postby catavengercaptain » Fri Jul 09, 2010 6:21 am

Thx I was wondering about them being brittle.

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heviarti
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Re: Ceramic knives

Postby heviarti » Fri Jul 30, 2010 5:26 am

I've got two of the Kyocera knives. They cut well, but haven't been what I am looking for. I was told to expect 'em to cut anything they touch, including *me* to the bone... but they're not to that level.

If you want, Vagrant, I can send you my spare for a while if you wanna try it. I about halfass stole 'em from a previous roomate along with a pair of boots (that I've worn completely out) and some six hundred rounds of 5.7X28... But he run off with my girlfriend, and abandoned those items here.... so he's lucky I only kep 'em and didn't opt for the backhoe option.

If the saddle leather works good, order a George Genovezos strop and put diamond strop paste on it. That should had oughtta give you an edge. The heel of your hand makes a good ersatz strop too, but prolly not for ceramic.
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Re: Ceramic knives

Postby Vagrant » Fri Jul 30, 2010 5:50 am

I think the comments satisfied my curiousity about ceramics.
I've tried flint-napping a couple times and there are LOTS of things I do better !
[I can make a pile of sharp little chips] :lol:

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heviarti
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Re: Ceramic knives

Postby heviarti » Fri Jul 30, 2010 6:06 am

My granddad does the whole bit with obsidian... but he does it thre lazy way: he cuts it to shape with a diamond saw, then knaps the edge. Sure makes funny looking arrow heads.
I walked a mile in my enemy's shoes.... And then I stole his shoes.

SpriteMakesMeShit
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Re: Ceramic knives

Postby SpriteMakesMeShit » Fri Jul 30, 2010 7:22 pm

We use them at the taco bell I work. Cut good but don't drop on the tile floor or they crack. I got writ up for breaking one.

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jmack1944
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Re: Ceramic knives

Postby jmack1944 » Thu Sep 30, 2010 5:21 am

Just ordered a couple ceramic folders. Curious to see what all the hype is about. Apparently they hold an edge ten times longer than steel. A customer of mine wanted them so that's why I ordered them. Anybody ever had a ceramic folder here on the forum? They are called 'ceramic' but apparently the blades are actually 'zirconium oxide'. What ever the hell that is.

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missaman
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Re: Ceramic knives

Postby missaman » Wed Dec 15, 2010 3:25 am

I purchased a ceramic knife at harbor crap tools NO comlaints in da' kitchen I thought 6 bucks was a very fair price. I have not abused it But Its all good inna' da hood I would purchase more. For medium duty kitchen use. :idea:
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Re: Ceramic knives

Postby Frank » Thu Dec 16, 2010 4:03 pm

jmack1944 wrote:Just ordered a couple ceramic folders. Curious to see what all the hype is about. Apparently they hold an edge ten times longer than steel. A customer of mine wanted them so that's why I ordered them. Anybody ever had a ceramic folder here on the forum? They are called 'ceramic' but apparently the blades are actually 'zirconium oxide'. What ever the hell that is.


It's the same stuff they make fake "diamonds" out of, Cubic Zirconia.

VBR,

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Christian
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Re: Ceramic knives

Postby Christian » Thu Dec 22, 2011 5:08 am

CERAMIC FOLDING KNIFE
There some increased hardness in a black ceramic knife blade but in reality the white blade is already so hard that this increase makes very little difference in terms of the ability to retain an edge. The only real reason, in my opinion, to purchase a black ceramic folding pocket knife is one of appearance. It just feels strange using a knife with a white blade that you can almost see through. The black blade on a ceramic pocket knife gives a much more traditional appearance & darn it, just plain looks better! The black blades are however, more expensive to produce, as they have to go through a secondary Hot Isostatic Process where pressure and extremely high temperatures physically change the blade from white to black and increase density & hardness. Keep in mind that increased hardness does also increase brittleness so a white ceramic bladed knife might actually be tougher in some applications as it would be more resistant to chipping.

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Ceramic knives

Postby Thorvelm » Mon Apr 25, 2016 12:06 pm

I dont recall hearing anything about not using ceramic blades on tomatoes, and we have been doing so for years with apparently no ill effects. Were ALWAYS careful to use only on a cutting board usually the nylon kind, and then we hand-wash only usually pretty soon after using the knife. After I snapped off the tip probably about 1/8" of our ceramic paring knife when I hit a bone, Im even more careful of what and how I cut with them.

The ceramic blades we use the most are name-brand Kyocera knives, and my personal favorite is a knife with a blade which is a little over 5 inches.


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